On a stainless‑steel reactor vessel in a chemical processing plant, the blind connection plate is fitted over the inlet opening that will later accommodate a temperature‑sensor probe. The plate acts as a permanent, pressure‑tight seal while the vessel is being fabricated, welded, and pressure‑tested, preventing moisture ingress and protecting internal surfaces from corrosion. During plant commissioning, the plate can be removed without cutting the vessel wall, allowing the sensor line to be bolted directly to the prepared flange, which saves both time and labor. In large‑scale installations such as utility‑plant pipelines, the same type of plate is used to close spare ports on pump casings or heat‑exchanger shells, providing a clean, weld‑ready surface that can be opened later for instrumentation or maintenance access. By serving as a placeholder for future connections, the blind connection plate eliminates the need for temporary gaskets or makeshift covers, thereby maintaining the integrity of the plant’s pressure boundary throughout construction, testing, and start‑up phases. When the plant reaches operational status, the plate is simply lifted and the designated component is installed, enabling immediate integration of the control system.